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. 2011 Oct 25;4:367–376. doi: 10.2147/JMDH.S24592

  • My own personal experience of benefit

  • The opinion of experts I trust

  • Clinical studies showing benefit

  • A positive small randomized controlled trial

  • A positive systematic review

  • A positive large randomized controlled trial

NOTE: if you answered “agree, strongly agree” to Q2 (harmful) you may skip Q6.